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Skid, to--To be carried sideways by centrifugal force when turning
to left or right.
Skid, Undercarriage--A spar, mounted in a fore and aft direction, and
to which the wheels of the undercarriage are sometimes attached.
Should a wheel give way the skid is then supposed to act like the
runner of a sleigh and to support the aeroplane.
Skid, Tail--A piece of wood or other material, orientable, and fitted
with shock absorbers, situated under the tail of an aeroplane in
order to support it upon the ground and to absorb the shock of
alighting.
Section--Any separate part of the top surface, that part of the bottom
surface immediately underneath it, with their struts and wires.
Spar--Any long piece of wood or other material.
Spar, Main--A spar within a surface and to which all the ribs are
attached, such spar being the one situated nearest to the centre
of pressure. It transfers more than half the lift from the ribs
to the bracing.
Spar, Rear--A spar within a surface, and to which all the ribs are
attached, such spar being situated at the rear of the centre of
pressure and at a greater distance from it than is the main spar.
It transfers less than half of the lift from the ribs to the bracing.
Strut--Any wooden member intended to take merely the stress of
direct compression.
Strut, Interplane--A strut holding the top and bottom surfaces apart.
Strut, Fuselage--A strut holding the fuselage longerons apart.
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